hibernate连接池

我分别用以下链接方式测试了一下:

tomcat自带的连接池

<propertyname="connection.datasource">java:comp/env/jdbc/mysqlds</property>

JDBC直接连接

<propertyname="hibernate.connection.url">jdbc:mysql://localhost:3333/message</property>

<propertyname="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>

<propertyname="hibernate.connection.username">root</property>

<propertyname="hibernate.connection.password">56906950</property>

<propertyname="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

<propertyname="hibernate.show_sql">true</property>

<propertyname="hibernate.hbm2ddl.auto">update</property>

#使用c3p0连接池

<propertyname="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>

<propertyname="hibernate.connection.url">jdbc:mysql://localhost:3333/message</property>

<propertyname="hibernate.connection.username">root</property>

<propertyname="hibernate.connection.password">56906950</property>

<propertyname="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>

<propertyname="hibernate.c3p0.min_size">8</property>

<propertyname="hibernate.c3p0.max_size">200</property>

<propertyname="hibernate.c3p0.timeout">600</property>

<propertyname="hibernate.c3p0.max_statements">0</property>

<propertyname="hibernate.c3p0.idle_test_period">60</property>

<propertyname="hibernate.c3p0.acquire_increment">2</property>

<propertyname="hibernate.c3p0.validate">true</property>

不知道我上面写的配置是不是正确,但愿不对....

然后写了一个测试方法:

longtime=System.currentTimeMillis();

for(inti=0;i<1000;i++){

Sessionsession=HibernateUtils.getSession();

HibernateUtils.closeSession(session);

}

System.out.println(System.currentTimeMillis()-time);

发现JDBC所花费的时间是最少的2000ms,其次是tomcat自带的连接池2096,c3p0竟然用了4950ms!

不是说c3p0是最成熟的吗?为何是这种情况,还是我写的测试方法不是很有效呢?谢谢啊

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